How many people named Laurence grow up to either become lawyers or marry lawyers? Further study is needed in this area. Maybe the Dennis to dentist dynamic is flawed because no one in their childhood want to be dentists. One very really encounters a spinster named Mary.

If, for example, no one was ever named Jerry prior to 1989 but in 1990 the name skyrocketed to prominence following the appearance of Seinfeld then there would be no dentists named Jerry despite Jerry being a popular name in the 1990 census.